This Volkswagen commercial is about one effort to get people to take the stairs instead of the escalator (presumably for the exercise). The company turned a staircase at a Stockholm subway station into a piano and videotaped how travelers responded.

This would likely create more loitering. And then more people being annoyed by the noise, because I bet it doesn't sound as nice as the fancy music they played throughout most of that video, especially with a crowd on it.